first decision: P series or LT? heavy hauling/towing/extreme rocky trails? go LT. If not, P series are cheaper and lighter, giving better MPG. Second desision: All-terrain or off-road tires? again ATs will be better MPG, quieter, better braking and wet traction. For me, ATs in a P series made sense. Using Tire Rack tool, I wanted good life, good braking in wet or dry, good snow/ice traction, and QUIET on the highway. Firestone Destination AT was top choice, followed by Yokohama Geolander. Yokohama's were $30/tire cheaper, so I got them. 20k miles later I love them.